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| author | Miquel Sabaté Solà <msabate@suse.com> | 2023-10-24 17:40:19 +0200 |
|---|---|---|
| committer | Miquel Sabaté Solà <mikisabate@gmail.com> | 2025-02-04 20:58:36 +0100 |
| commit | 149020464517ff3d021eef5ccd50d3939ad463e6 (patch) | |
| tree | 056ec1919fe0c0d515e7a0a414916307b768ef84 /space/include/ppu.s | |
| parent | be2414f5b11b182998fca7e87712ff0502c8ee93 (diff) | |
| download | code.nes-149020464517ff3d021eef5ccd50d3939ad463e6.tar.gz code.nes-149020464517ff3d021eef5ccd50d3939ad463e6.zip | |
Lay out a proper structure for the project
Let's divide things by topic instead of a broad "examples" directory.
This will allow for simple files to co-exist together with full-blown
projects.
Signed-off-by: Miquel Sabaté Solà <msabate@suse.com>
Diffstat (limited to 'space/include/ppu.s')
| -rw-r--r-- | space/include/ppu.s | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/space/include/ppu.s b/space/include/ppu.s new file mode 100644 index 0000000..23fd978 --- /dev/null +++ b/space/include/ppu.s @@ -0,0 +1,27 @@ +.segment "CODE" + +.scope PPU + CONTROL = $2000 + MASK = $2001 + STATUS = $2002 + SCROLL = $2005 + ADDRESS = $2006 + DATA = $2007 +.endscope + +.macro PPU_ADDR address + lda #.HIBYTE(address) + sta PPU::ADDRESS + lda #.LOBYTE(address) + sta PPU::ADDRESS +.endmacro + +;; WRITE_PPU_DATA is a macro that will write into PPU::ADDRESS the given address +;; and into PPU::DATA the given byte value. +.macro WRITE_PPU_DATA address, value + bit PPU::STATUS + + PPU_ADDR address + lda #value + sta PPU::DATA +.endmacro |